Why do you think that is related to antibiotic use in infancy? Are urban kids more likely to receive medical treatment as infants? Seemingly, bad air and water

Why do you think that is related to antibiotic use in infancy? Are urban kids more likely to receive medical treatment as infants? Seemingly, bad air and water quality and exposure to industrial contaminants explains some of why urban people would have poorer autoimmune health than rural. Asthma especially has very straightforwardly tracked automobile emissions.